ecmtuning v3

[FCR]

does anybody knows the values in psi when you go to the live direct access to the ecu in the open loop max, open loop min, tmng max oct screens.... Thanks

 

[4thStroke]

The column on the left hand side is not boost, it is the load factor. There are a few variables that determine the load factor, it is not completely airflow dependent.

 

[FCR]

Thanks but how it works bc i was wondering if theres a possibility to convert or have an idea in psi or any other approximate value

 

[belize1334]

In the stock ECU code the load factor is derived from the ECU's best guess at airflow given the MAF signal and barometric pressure and temperature. DSMLink uses the same load rows but extends the range. And if you're in SD then the method of calculation is different but they still have the same meaning. The load is very nearly a measure of airflow per revolution of the engine. The loading is given by almost 0.175 g/rev per load number. That's not exactly right 'cause it isn't linear but the 12th (highest) load row on the stock code is achieved at 2.1g/rev. Now as for psi, a given turbo will have an efficiency range but if you stay within it you can roughly call g/rev proportional to psi. It's not exactly right but it's close. The problem is that the proportionality is different for every turbo. On a 14b we hit 2.1g/rev at about 14psi which is 28.7 psig (boost pressure plus atmospheric pressure). That corresponds to 12 load rows so you're at ROUGHLY 2.2 psig per load row. Now, you put a bigger turbo on there and that'll be out the window 'cause they move more air at lower pressure... The end result is that nobody can tell you how many psi per load for your setup. You have to figure it out from datalogging. Expect it to go almost linearly with manifold absolute pressure (map = psig @ intake manifold) but not exactly. And expect to have fewer psi per load row as the turbo size is increased.